package com.graduationproject.examonline.webSocket.server;

import java.io.IOException;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.graduationproject.examonline.exam.entity.Exam;
import com.graduationproject.examonline.exam.mapper.ExamMapper;
import com.graduationproject.examonline.utils.SpringContextUtil;
import com.graduationproject.examonline.webSocket.entity.WebSocket;
import org.apache.ibatis.javassist.tools.web.Webserver;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;


/**
 * @author zhengkai.blog.csdn.net
 */
@ServerEndpoint("/myServer/{userId}")
@Component
public class WebSocketServer {

    /**
     * 静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
     */
    private static int onlineCount = 0;
    /**
     * concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
     */
    private static ConcurrentHashMap<String, WebSocketServer> webSocketMap = new ConcurrentHashMap<>();
    /**
     * 与某个客户端的连接会话，需要通过它来给客户端发送数据
     */
    private Session session;
    /**
     * 接收userId
     */
    private String userId = "";

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam("userId") String userId) {
        this.session = session;
        this.userId = userId;
        if (webSocketMap.containsKey(userId)) {
            webSocketMap.remove(userId);
            webSocketMap.put(userId, this);
            //加入set中
        } else {
            webSocketMap.put(userId, this);
            //加入set中
            addOnlineCount();
            //在线数加1
        }
        System.out.println("用户连接:" + userId + ",当前在线人数为:" + getOnlineCount());
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        if (webSocketMap.containsKey(userId)) {
            webSocketMap.remove(userId);
            //从set中删除
            subOnlineCount();
        }
        System.out.println("用户退出:" + userId + ",当前在线人数为:" + getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        System.out.println("用户消息:" + userId + ",报文:" + message);
        //可以群发消息
        //消息保存到数据库、redis
        try {
            //解析发送的报文
            JSONObject jsonObject = JSON.parseObject(message);
            //追加发送人(防止串改)
            jsonObject.put("fromUserId", this.userId);
            String toUserId = jsonObject.getString("toUserId");
            String order = jsonObject.getString("order");
            //传送给对应toUserId用户的websocket
//            webSocketMap.get(userId).sendMessage(jsonObject.toJSONString());

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        System.out.println("用户错误:" + this.userId + ",原因:" + error.getMessage());
        error.printStackTrace();
    }

    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }


    /**
     * 发送自定义消息
     */
    public static void sendInfo(Map<String, Object> message, @PathParam("userId") String userId) throws IOException {
        System.out.println("发送消息到:" + userId + "，报文:" + JSONObject.toJSONString(message));
        webSocketMap.get(userId).sendMessage(JSONObject.toJSONString(message));
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        WebSocketServer.onlineCount--;
    }

    public void updateStatus() {
        try {
            ExamMapper examMapper = (ExamMapper) SpringContextUtil.getBean("examMapper");
            if (examMapper != null) {
                List<Exam> examList = examMapper.getExamList();
                Map<String, Object> message1 = new HashMap<String, Object>();
                List<Map<String, Object>> examStatusList = new ArrayList<Map<String, Object>>();
                for (int i = 0; i < examList.size(); i++) {
                    Map<String, Object> message2 = new HashMap<String, Object>();
                    Exam exam = examList.get(i);
                    message2.put("exam_id", exam.getExam_id());
                    message2.put("exam_status", exam.getExam_status());
                    examStatusList.add(message2);
                }
                message1.put("examListStatus", examStatusList);
                sendMessageToAll(message1);
//                for (WebSocketServer item : webSocketMap.values()) {
//                    item.session.getAsyncRemote().sendText(JSONObject.toJSONString(message1));
//                }
            } else {
                System.out.println(new Date().toString() + " 161:null");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void sendMessageToAll(Map<String, Object> message1) {
        for (WebSocketServer item : webSocketMap.values()) {
            System.out.println("sendMessageToAll：" + new Date().toString() + message1);
            item.session.getAsyncRemote().sendText(JSONObject.toJSONString(message1));
        }
    }

}
